diff --git a/lib/api/GwApi.h b/lib/api/GwApi.h
index afef372..9611707 100644
--- a/lib/api/GwApi.h
+++ b/lib/api/GwApi.h
@@ -129,4 +129,7 @@ class GwApi{
 #ifndef DECLARE_CAPABILITY
 #define DECLARE_CAPABILITY(name,value)
 #endif
+#ifndef DECLARE_STRING_CAPABILITY
+#define DECLARE_STRING_CAPABILITY(name,value)
+#endif
 #endif
diff --git a/lib/exampletask/GwExampleTask.h b/lib/exampletask/GwExampleTask.h
index b759c93..cb128a5 100644
--- a/lib/exampletask/GwExampleTask.h
+++ b/lib/exampletask/GwExampleTask.h
@@ -46,4 +46,6 @@ DECLARE_CAPABILITY(testboard2,true);
 //hide some config value
 //just set HIDE + the name of the config item to true
 DECLARE_CAPABILITY(HIDEminXdrInterval,true);
+
+DECLARE_STRING_CAPABILITY(HELP_URL,"https://www.wellenvogel.de");
 #endif
\ No newline at end of file
diff --git a/lib/usercode/GwUserCode.cpp b/lib/usercode/GwUserCode.cpp
index df5a633..1e36e13 100644
--- a/lib/usercode/GwUserCode.cpp
+++ b/lib/usercode/GwUserCode.cpp
@@ -41,7 +41,8 @@ class GwUserCapability{
 #define DECLARE_USERTASK(task) GwUserTaskDef __##task##__(task,#task);
 #define DECLARE_USERTASK_PARAM(task,...) GwUserTaskDef __##task##__(task,#task,__VA_ARGS__);
 #define DECLARE_INITFUNCTION(task) GwInitTask __Init##task##__(task,#task);
-#define DECLARE_CAPABILITY(name,value) GwUserCapability __CAP##name##__(#name,#value); 
+#define DECLARE_CAPABILITY(name,value) GwUserCapability __CAP##name##__(#name,#value);
+#define DECLARE_STRING_CAPABILITY(name,value) GwUserCapability __CAP##name##__(#name,value); 
 #include "GwApi.h"
 #include "GwUserTasks.h"
 class TaskApi : public GwApi
diff --git a/web/index.html b/web/index.html
index c5bde6e..a607101 100644
--- a/web/index.html
+++ b/web/index.html
@@ -21,6 +21,7 @@
   <div class="tab" data-page="xdrPage">XDR</div>
   <div class="tab" data-page="dashboardPage">Data</div>
   <div class="tab" data-page="updatePage">Update</div>
+  <div class="tab" data-url="https://github.com/wellenvogel/esp32-nmea2000" data-window="help" id="helpButton">Help</div>
 </div>
 <div id="statusPage" class="tabPage">
   <div id="statusPageContent">
diff --git a/web/index.js b/web/index.js
index ae9a10c..d66723b 100644
--- a/web/index.js
+++ b/web/index.js
@@ -1073,6 +1073,10 @@ function createConfigDefinitions(parent, capabilities, defs,includeXdr) {
 function loadConfigDefinitions() {
     getJson("api/capabilities")
         .then(function (capabilities) {
+            if (capabilities.HELP_URL){
+                let el=document.getElementById('helpButton');
+                if (el) el.setAttribute('data-url',capabilities.HELP_URL);
+            }
             getJson("config.json")
                 .then(function (defs) {
                     getJson("xdrconfig.json")
@@ -1191,7 +1195,11 @@ function converterInfo() {
 }
 function handleTab(el) {
     let activeName = el.getAttribute('data-page');
-    if (!activeName) return;
+    if (!activeName) {
+        let extUrl= el.getAttribute('data-url');
+        if (! extUrl) return;
+        window.open(extUrl,el.getAttribute('data-window')||'_');
+    }
     let activeTab = document.getElementById(activeName);
     if (!activeTab) return;
     let all = document.querySelectorAll('.tabPage');